<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 :closable="false"(是否展示“X”号) show-icon(显示图标) -->
            <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon>
            </el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader expandTrigger='hover' v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="handleChange" clearable>
                    </el-cascader>
                </el-col>
                <el-col></el-col>
            </el-row>

            <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 将标签页改为many -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数按钮 -->
                    <el-button size="mini" type="primary" :disabled="isButtonDisabled" @click="addDialogVisible = true">添加参数</el-button>
                     <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ 点击添加</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                 <!-- 添加静态属性的面板 将标签页改为only -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性按钮 -->
                    <el-button size="mini" type="primary" :disabled="isButtonDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ 点击添加</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数或属性对话框 -->
        <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <!-- 添加表单 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数或属性对话框 -->
        <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
        <!-- 添加表单 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 分类列表
            cateList: [],
            // 用户在级联下拉菜单中选中的分类id
            selectedCateKeys: [],
            // 配置级联菜单中数据如何展示
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            activeName: 'many',
            // 动态参数数据
            manyTableData: [],
            // 静态属性数据
            onlyTableData: [],
            // 控制添加参数.属性对话框的显示或隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            // 添加表单验证规则
            addFormRules: {
                attr_name: [{ required: true, message: '请输入名称', trigger: 'blur' }]
            },
            // 控制修改参数.属性对话框的显示或隐藏
            editDialogVisible: false,
            // 修改参数.属性对话框中的表单
            editForm: {
                attr_name: ''
            },
            // 修改表单的验证规则
            editFormRules: {
                attr_name: [
                { required: true, message: '请输入名称', trigger: 'blur' }
                ]
            }
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有的商品分类列表
        async getCateList() {
        const { data: res } = await this.$http.get('categories')

        if (res.meta.status !== 200) {
            return this.$message.error('获取分类数据失败')
        }
        // 将数据列表赋值给cateList
        this.cateList = res.data
        // 保存总数据条数
        // this.total = res.data.total
        // console.log(res.data);
      },
      // 级联框切换
      handleChange() {
          this.getParamsData()
      },
      // tab栏被点击时的触发事件
      handleTabClick() {
        this.getParamsData()
        console.log(this.activeName)
      },
      // 获取参数和属性的数据
      async getParamsData() {
        // 当用户在级联菜单中选择内容改变时触发]
        // 如果不是三级分类，清空数组,同时清空下方的表格数据
        if (this.selectedCateKeys.length !== 3) {
            this.selectedCateKeys = []
            this.manyTableData = []
            this.onlyTableData = []
        }
        // 如果是三级分类
        console.log(this.selectedCateKeys)
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
        if (res.meta.status !== 200) return this.$message.error('获取参数失败')
        // 将数据中的attr_vals属性字符串分割成数组
        res.data.forEach(item => {
           item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
           item.inputVisible = false
           item.inputValue = ''
        })
        console.log(res.data)
        // 判断获取的是动态参数的数据还是静态属性的数据,分别保存
        if (this.activeName === 'many') {
            this.manyTableData = res.data
        } else {
            this.onlyTableData = res.data
        }
      },
      // 添加参数/属性
      addParams() {
        // 当用户点击对话框中的确定时，校验表单
        this.$refs.addFormRef.validate(async valid => {
            // 校验不通过，return
            if (!valid) return
            // 校验通过，发送请求完成添加参数或者属性
            const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
            {
                attr_name: this.addForm.attr_name,
                attr_sel: this.activeName
            }
            )
            console.log(res)
            if (res.meta.status !== 201) {
                return this.$message.error('添加' + this.titleText + '数据失败')
            }
            this.$message.success('添加' + this.titleText + '数据成功')
            this.addDialogVisible = false
            this.getParamsData()
            this.getCateList()
        })
      },
      // 添加对话框关闭触发
      addDialogClosed() {
          this.$refs.addFormRef.resetFields()
      },
      async showEditDialog(attrId) {
            // 发起请求获取需要修改的那个参数数据
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`,
            { params: { attr_sel: this.activeName } })
            if (res.meta.status !== 200) {
                return this.$message.error('获取参数数据失败')
            }
            this.editForm = res.data
            // 显示修改参数.属性对话框
            this.editDialogVisible = true
      },
      // 当关闭修改参数.属性对话框时
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      // 验证表单
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
            if (!valid) return
            // 发送请求完成修改
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            { attr_name: this.editForm.attr_name, attr_sel: this.activeName })

            if (res.meta.status !== 200) {
            return this.$message.error('获取参数数据失败')
            }
            this.$message.success('修改' + this.titleText + '数据成功')
            this.editDialogVisible = false
            this.handleChange()
        })
      },
      // 删除对应的事件处理函数
      async removeParams(attrId) {
            // 根据id删除对应的参数或属性
            // 弹窗提示用户是否要删除
            const confirmResult = await this.$confirm(
                '请问是否要删除该' + this.titleText,
                '删除提示',
                {
                    confirmButtonText: '确认删除',
                    cancelButtonText: '取消',
                    type: 'warning'
                }
            ).catch(err => err)
            // 如果用户点击确认，则confirmResult 为'confirm'
            // 如果用户点击取消, 则confirmResult获取的就是catch的错误消息'cancel'
            if (confirmResult !== 'confirm') {
                return this.$message.info('已经取消删除')
            }

            // 没有取消就是要删除，发送请求完成删除
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)

            if (res.meta.status !== 200) {
                return this.$message.error('删除参数数据失败')
            }
            this.$message.success('删除' + this.titleText + '数据成功')
            this.handleChange()
      },
      // 最后对应文本框的事件和按钮的事件添加处理函数
      async handleInputConfirm(row) {
        if (row.inputValue.trim().length === 0) {
            row.inputValue = ''
            row.inputVisible = false
            return null
        }
        // 如果没有输入空字符,则继续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        this.saveAttrVals(row)
      },
      // 点击添加按钮时触发
      showInput(row) {
        row.inputVisible = true
        // 让文本框自动获得焦点
        // $nextTick方法的作用,就是当页面上的元素被重新渲染之后,才能指定回调函数中的代码
        this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      // 点击删除按钮时触发
      handleClose(index, row) {
        // 删除对应索引的参数可选项
        row.attr_vals.splice(index, 1)
        // 调用函数，完成保存可选项的操作
        this.saveAttrVals(row)
      },
      // 调用接口将数据存储到后台数据库
      async saveAttrVals(row) {
        // 需要将数组重新转换为字符串
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
        if (res.meta.status !== 200) return this.$message.error('更新数据失败!')
        this.$message.success('更新数据成功!')
      }
    },
    computed: {
        // 判断添加按钮是否被禁用 级联选择框选中长度为3 返回true 否则返回false
        isButtonDisabled() {
            return this.selectedCateKeys.length !== 3
        },
        // 获取三级分类id
        cateId() {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[this.selectedCateKeys.length - 1]
            }
            return null
        },
        // 用于判断显示那个对话框标题
        titleText() {
            if (this.activeName === 'many') return '动态参数'
            return '静态属性'
        }
    }
}
</script>

<style lang="less" scoped>
    .cat_opt {
        margin: 15px 0;
    }
    .el-tag {
        margin: 10px;
    }
    .input-new-tag {
        width: 150px;
    }
</style>
